文献类型：期刊文献

英文题名：Sub-particle scale study on the melting behavior of Zhundong coal ash based on the heterogeneous distribution of elements

作者：Zhou, Zhihao[1,2];Shen, Zhongjie[1,2];Liang, Qinfeng[1,2];Liu, Haifeng[1,2]

机构：[1]East China Univ Sci & Technol, Shanghai Engn Res Ctr Coal Gasificat, POB 272, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Inst Clean Coal Technol, POB 272, Shanghai 200237, Peoples R China

年份：2020

卷号：216

起止页码：223

外文期刊名：COMBUSTION AND FLAME

收录：;EI(收录号：20201408374056);WOS:【SCI-EXPANDED(收录号:WOS:000533624800021)】；

基金：This study was supported by National Key R&D Program of China (2018YFC0808500), the Shanghai Engineering Research Center of Coal Gasification (18DZ2283900), the China Postdoctoral Science Foundation (2018M632041), and the Fundamental Research Funds for the Central Universities (222201817004 and 222201814052).

语种：英文

外文关键词：Sub-particle scale; Zhundong coal; Element heterogeneous distribution; In-situ combustion; Residual ash particle; Melting behavior

摘要：The current research work focused on the effect of the heterogeneous distribution of elements on the ash melting behavior of Zhundong coal at the sub-particle scale by using a high temperature stage microscope (HTSM) and scanning electron microscope (SEM) equipped with energy dispersive spectrometry (EDS). Experimental results showed that both molten and unmolten areas existed in the residual ash sample after combustion below 1200 degrees C. Below this temperature, the partial ash melting behavior was significantly found during the ash melting process. Comparing the element composition of local molten and unmolten areas, Na, Si and Mg played predominant roles in the partial melting behavior. The enrichment of Na and Si promoted the formation of low temperature eutectic mixture and further molten areas, while the unmolten areas were rich in Mg. Combined with the micro-Raman analysis, minerals like spinel and forsterite that containing Mg were the main refractory components in the unmolten areas. Thermodynamic calculation results from FactSage software showed that the mass fraction of the liquid phase started to form rapidly at about 1100 degrees C in molten areas mainly with the fast melting of olivine and nepheline. However, the unmolten areas started to melt swiftly at about 1200 degrees C mainly with the fast melting of merwinite. Spinel was the main refractory component in both molten and unmolten areas. (C) 2020 The Combustion Institute. Published by Elsevier Inc. All rights reserved.